Number of Pages (Cards) to Show

This parameter is only used in Flash Card type lessons. The default value is zero
which means that all the Pages/Cards are shown in a lesson. Setting this parameter to
a non-zero value shows that number of pages. After that number of Page/Cards have been
shown the end of lesson is reached and the student is shown their grade.

If this parameter is set to a number greater than the number of pages in the lesson then
the end of the lesson is reached when all the pages have been shown.